How the Mentioned CVE Works:
CVE-2025-XXXX is a command injection vulnerability affecting Kubernetes Windows nodes. The flaw exists in the `nodes//logs/query` API endpoint, which is used to query logs on worker nodes. An attacker with access to this endpoint can craft malicious input that gets executed as a command on the host system. This vulnerability specifically impacts Windows worker nodes running Kubernetes versions below 1.29.13, between 1.30.0-alpha.0 and 1.30.9, between 1.31.0-alpha.0 and 1.31.5, and between 1.32.0-alpha.0 and 1.32.1. The issue arises due to insufficient input sanitization, allowing attackers to inject arbitrary commands via the log query parameters.
DailyCVE Form:
Platform: Kubernetes
Version: <1.29.13, 1.30.0-1.30.9, 1.31.0-1.31.5, 1.32.0-1.32.1
Vulnerability: Command Injection
Severity: Moderate
Date: Mar 13, 2025
What Undercode Say:
Exploitation:
1. Exploit Command Injection:
An attacker can exploit this vulnerability by sending a crafted HTTP request to the `/logs/query` endpoint with malicious input. For example:
curl -X GET "http://<node-ip>:10250/logs/query?cmd=malicious_command"
This could execute arbitrary commands on the Windows node.
2. Proof of Concept (PoC):
A simple PoC to list files on the host:
curl -X GET "http://<node-ip>:10250/logs/query?cmd=dir+C:\"
3. Exploit Impact:
Successful exploitation can lead to full control of the Windows node, allowing attackers to exfiltrate data, deploy malware, or pivot to other systems.
Mitigation:
1. Patch Immediately:
Upgrade to the patched versions: 1.29.13, 1.30.9, 1.31.5, or 1.32.1.
kubectl upgrade --version=<patched-version>
2. Restrict Access:
Limit access to the `/logs/query` endpoint using network policies or firewalls.
Example network policy:
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: restrict-logs-access
spec:
podSelector: {}
ingress:
- from:
- ipBlock:
cidr: <trusted-ip-range>
ports:
- protocol: TCP
port: 10250
3. Input Sanitization:
Implement input validation and sanitization for log query parameters to prevent command injection. Example in Go:
func sanitizeInput(input string) string {
return strings.ReplaceAll(input, ";", "")
}
4. Monitor Logs:
Regularly monitor logs for suspicious activity using tools like Falco or Sysmon. Example Falco rule:
- rule: Kubernetes Log Query Exploit desc: Detect suspicious log query activity condition: evt.type=exec and evt.args contains "/logs/query" output: "Potential log query exploit detected" priority: WARNING
5. Disable Unused Endpoints:
If the `/logs/query` endpoint is not required, disable it by modifying the kubelet configuration:
--feature-gates=LogsQueryEndpoint=false
6. Use RBAC:
Restrict access to the endpoint using Role-Based Access Control (RBAC). Example:
apiVersion: rbac.authorization.k8s.io/v1 kind: Role metadata: name: logs-query-role rules: - apiGroups: [bash] resources: [bash] verbs: [bash]
By following these steps, you can protect your Kubernetes Windows nodes from this command injection vulnerability.
References:
Reported By: https://github.com/advisories/GHSA-vv39-3w5q-974q
Extra Source Hub:
Undercode
